Which three of the following statements regarding decentralized finance $($DeFi$)$ are correct?

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Ethereum$$s blockchain hosts the vast majority of the smart contracts that support DeFi.Ethereum$$s blockchain hosts the vast majority of the smart contracts that support DeFi.

Ether $($gas fees$)$ is the most common medium of exchange in the smart contracts that support DeFi.Ether $($gas fees$)$ is the most common medium of exchange in the smart contracts that support DeFi.

It uses smart contracts built on blockchains to eliminate the requirement of trust and to reduce transaction fees.It uses smart contracts built on blockchains to eliminate the requirement of trust and to reduce transaction fees.

Because it is the largest cryptocurrency, most smart contracts are built on the Bitcoin $($BTC$)$ blockchain.